CN1949766A - Method for distributing tag, computing route distance and implementing back-up switching in ring network by multiprotocol tag - Google Patents
Method for distributing tag, computing route distance and implementing back-up switching in ring network by multiprotocol tag Download PDFInfo
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Abstract
The invention relates to a method for making label allocation on ring network, calculating routing distance and implementing backup switching, and its kernel: separately allocting labels to node on ring network along clockwise and anticlockwise rings, respectively, and calculating routing distances between the node and lower-ring nodes, and based on the calculated results, respectively establishing corresponding relation between master and backup label exchange paths between the node and lower-ring node; when the master label exchange path fails, it switches the operating path to the backup label exchange path according to the corresponding relation. Thus, when adding/removing a node to/from a ring, the ring network can still operate; moreover, it is based on MPLS and transmits messages by the shortest path, thus raising transmitting efficiency; it can run failure detection protocol between adjacent nodes, thus increasing detecting and backup switching speeds; in addition, the invention supports inter-ring connection and connection with other MPLS networks.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of on looped network, adopt multiple label switching technology distributing labels, computing route distance from, and realize the method that backup is switched.
Background technology
Multiprotocol label switching (MPLS) technology has been introduced the mechanism based on label, and routing and forwarding are separated, and stipulates a grouping by the path of network by label, and transfer of data is finished by label switched path (LSP).Article one, LSP is unidirectional, two LSP of full duplex service needed.
At present, the application on the network is more and more, and network just must guarantee its service quality when fault takes place.Therefore each operator has proposed when network breaks down, and realizes the method for link protection.
The prior art one relevant with the present invention is based on stretch grouped data ring (PRP) technology and realizes the faulty link protection, and its core is: link together at the intra-node at the faulty link two ends reciprocal dicyclo with RPR, form a new looped network again; The data traffic that was transmitting on original ring is by wraparound (wrap) protected mode or copy nearly (steering also has to be called source routing) protected mode and transmit data traffic to destination node.
By the technical scheme of above-mentioned prior art as can be seen, there is following defective in prior art one:
1, require to adopt between 2 paired optical fiber to form reciprocal dicyclo;
2, each section optical fiber on the reciprocal dicyclo must operate at same speed, and is when flow has the property of converging characteristics, low away from the fiber resource utilance of convergent point;
3, failure detection protocol need to be around one week of ring, and detection speed is slow;
4, the RPR head length is bigger, and packaging efficiency is low;
5, do not support transannular;
6. realize complexity, protocol processes needs hardware supports, the cost height.
The prior art two relevant with the present invention is based on rapid ring protection protocol (Rapid RingProtection Protocol; RRPP) technology realizes the faulty link protection.
Disposition when changing take the monocycle topology illustrates its process as example:
When all links all are in health status on the whole looped network, form the broadcasting loop in order to prevent the data message on it, host node blocks its secondary port.Host node periodically sends HELLO newspaper zhang from its master port, passes through successively each transmission node, gets back to host node from the secondary port of host node at last.
When the RRPP port generation link failure on the transmission node switch, this node will be that the RRPP port of UP sends Link-Down message notifying host node from the state with the non-working port pairing.
After host node is received the Link-Down message, will switch to the Failed state immediately, decontrol secondary port.Because network topology changes, for avoiding the directed mistake of message, host node also needs to refresh forwarding database (Forwarding Database; FDB), and from all transmission nodes of master port transmission COMMON-FLUSH-FDB message notifying refresh FDB.
The mechanism that fault reports is initiated by transmission node, if Link-Down message unfortunate losing in transmission course, at this moment the looped network state-detection mechanism by host node can detect non-working port.If the secondary port of host node is not still received the HELLO message that host node sends at the appointed time, think that also looped network breaks down, fault handling process and transmission node are initiatively reported make same treatment.
When the RRPP port on the transmission node switch recovered, transmission node was moved to the Preforwarding state, and blocked the port that has just recovered.Simultaneously, the transmission node of generation link-recovery also will send from the RRPP port with the UP state that is in that recovers port-pairing Link-Up message notifying host node.
After host node is received the Link-Up message of transmission node transmission, send the COMMON-FLUSH-FDB message from major and minor port respectively, notify all transmission nodes to refresh FDB.
Host node does not represent the response processing that looped network is recovered to the response of Link-Up message.If have on the looped network more than a link occurs fault, certain bar link-recovery wherein then for the FDB table of each node on can the fast refresh ring, has been introduced the response handler system that transmission node Link-Up reports mechanism and host node.
The process that looped network recovers is initiatively initiated by host node, host node cycle send the HELLO message from master port, after the faulty link full recovery on the looped network, host node will be received the detection messages of oneself sending from secondary port.
After host node is received the HELLO message that oneself sends, at first state transition is returned the Complete state, block secondary port, send the COMPLETE_FLUSH_FDB message from master port then.After transmission node is received the COMPLETE_FLUSH_FDB message, move back the Link-Up state, decontrol interim port blocked, and refresh the FDB table.
If unfortunate COMPLETE_FLUSH_FDB message is lost in communication process, also have a kind of back mechanism to realize the recovery of the interim port blocked of transmission node, if be exactly that transmission node can not receive the COMPLETE_FLUSH_FDB message that host node is sent in (by the definition of Fail timer) when being in the Preforwarding state at the appointed time, decontrol interim port blocked voluntarily, restore data communication.
For a plurality of crossing RRPP ring, the difference of itself and monocycle is to have introduced main ring neutron loop protocol message channel status testing mechanism in many rings, before passage interrupted the secondary port relieving of subring host node, the edge port that blocks fringe node earlier prevented to form between subring the data broadcasting loop; In addition, when node is received the COMMON-FLUSH-FDB of subring or COMPLETE-FLUSH-FDB message on the main ring, all can cause refreshing FDB; The COMPLETE-FLUSH-FDB of subring can not cause the subring transmission node to decontrol interim port blocked, only receives that the COMPLETE-FLUSH-FDB message of main ring oneself just can be done like this.
By the technical scheme of above-mentioned prior art two as can be seen, there is following defective in it:
1, the operate as normal of looped network depends on unique host node, if this node failure, whole looped network is unavailable;
2, having only a direction to E-Packet on the looped network, is not shortest path, low, the waste bandwidth of forward efficiency;
3, failure detection protocol need to be around one week of ring, and detection speed is slow;
4, based on the forwarding of MAC head, speed is slower;
5, prior art can only be based on ethernet link layer.
Summary of the invention
The purpose of this invention is to provide a kind of multiple label switching technology that adopts and realize the method that backup is switched on looped network, by the present invention, newly-increased on ring/as to remove in the process of a node, by switching, looped network still can be worked; And the present invention is independent of link layer protocol, and the link on the looped network between each node can be an any type, thereby uses more convenient; Moreover the present invention is based on MPLS technology encapsulated message and can E-Packeting, thereby improve forward efficiency by shortest path; By the present invention, failure detection protocol can operate between adjacent node, does not need around one week of ring, thereby can improve detection speed.
The purpose of this invention is to provide a kind of method in looped network employing multiple label switching technology distributing labels, by the present invention, can give each node along the clockwise and counterclockwise independent distributing labels of looped network respectively.
The purpose of this invention is to provide a kind of on looped network, adopt the multiple label switching technology computing route distance from method, by the present invention, when can distribute label, calculate the internodal route distance of described node to the FEC correspondence of label mapping for node on the looped network.
The objective of the invention is to be achieved through the following technical solutions:
The invention provides a kind of method that adopts the multiple label switching technology distributing labels on looped network, it comprises:
A, based on tag distribution protocol, be that a forwarding equivalence class FEC of the lower link point on the looped network distributes two labels, and from described lower link point, with described two labels respectively along clockwise and the inverse time needle ring be handed down to other each node on the looped network.
Wherein, described steps A specifically comprises:
A1, based on tag distribution protocol, be that a forwarding equivalence class FEC of the lower link point on the looped network distributes two labels;
A2, from described lower link point, with described two labels respectively along clockwise and/or the inverse time needle ring is handed down to and the looped network node that link point is adjacent up and down;
After A3, described node receive described label, judge whether the FEC of described label mapping is oneself, if then make the label that distributes invalid, and stop to continue to issue described label along clockwise and/or inverse time needle ring respectively; Otherwise obtain described label, and continue to issue described label along clockwise and/or inverse time needle ring respectively and give next node, change then steps A 3 over to.
Wherein, when the ring exterior node when a lower link point on the looped network links to each other, described steps A 1 specifically comprises:
When the tag mapping information of A11, described ring exterior node arrived described lower link point on the looped network, described lower link point obtained corresponding tag mapping information;
A12, based on tag distribution protocol, the respective labels map information that obtains according to described lower link point is that the lower link point on the looped network distributes two labels;
Wherein, when the ring exterior node when at least two lower link points on the looped network link to each other, described steps A 1 specifically comprises:
When each on the tag mapping information arrival looped network of A13, described ring exterior node descended link point, each lower link point obtained respectively corresponding tag mapping information;
A14, based on tag distribution protocol, according to each following respective labels map information of obtaining of link point, be that it distributes two labels.
Wherein, in the steps A 3, when described node judges that the FEC of label mapping is not oneself, obtain described label, and continue to issue described label along clockwise and/or inverse time needle ring respectively and specifically comprise for the process of next node:
When described node judges that the FEC of label mapping is not oneself, after node and ring exterior node obtain label from the looped network simultaneously according to a node, select the outer label of ring, abandon the principle of the label that node issues on the looped network, obtain the label that two lower link points on the looped network issue along up time needle ring or inverse time needle ring, and with described label continue respectively along clockwise or the inverse time needle ring be handed down to next node.
The invention provides a kind of multiple label switching technology computing route distance that adopts from method on looped network, it comprises:
B, based on tag distribution protocol, be that a forwarding equivalence class FEC of the lower link point on the looped network distributes two labels, and for it distance parameter be set;
C, when from described lower link point, described two labels respectively along clockwise and inverse time needle ring when being handed down on the looped network node, are added 1 with the value of described distance parameter, obtain the distance that described node arrives the route of described lower link point.
Wherein, described step B specifically comprises:
B1, from described lower link point, with described two labels respectively along clockwise and the inverse time needle ring is handed down to and looped network about the adjacent node of link point;
After B2, described node receive described label, judge whether the FEC of described label mapping is oneself, if then make institute that distributed labels is invalid, and stop to continue to issue described label along clockwise and inverse time needle ring respectively; Otherwise execution in step B3;
B3, described distance parameter is added 1, and continue respectively along clockwise and the inverse time needle ring issue described two labels to next node, change then step B2 over to.
The invention provides a kind of multiple label switching technology that adopts and realize the method that backup is switched on looped network, it comprises:
Pressed on ring node on D, the looped network is set up respectively it to primary label switched path and label switched path for subsequent use and the corresponding relation between them of lower link point;
E, when breaking down,, operating path is switched on the standby label switched path according to described corresponding relation based on multiple label switching technology with label switched path when main.
Wherein, described step D specifically comprises:
Pressed on ring node on D1, the looped network gets access to looped network two labels that link point edge is clockwise and the inverse time needle ring is distributed up and down, the pressed on ring node that calculates on the described label respective path arrives the internodal distance of same lower ring, and determines primary label switched path and label switched path for subsequent use according to result of calculation;
D2, set up the corresponding relation between primary label switched path and label switched path for subsequent use.
Wherein, described step D1 specifically comprises:
D11, based on tag distribution protocol, the pressed on ring node on the looped network obtains a lower link point on the looped network two labels that to be a forwarding equivalence class FEC issue along up time needle ring and inverse time needle ring; Or, obtain two labels that two different lower link points on the looped network issue along up time needle ring or inverse time needle ring for same FEC;
D12, calculate last link on the described label respective path based on Routing Protocol and put the internodal distance of described ring down, determine describedly to go up link to put described ring down internodal main with label switched path and standby label switched path according to result of calculation; Or,
When described pressed on ring node gets access to described two labels, the pressed on ring node that calculates and obtain on the described label respective path arrives the internodal distance of described lower ring, and determines that according to distance described pressed on ring node is to the internodal primary label switched path of described lower ring and label switched path for subsequent use.
Wherein, described step D11 specifically comprises:
D111, based on tag distribution protocol, be that the lower link point on the looped network distributes two labels, and from described lower link point, with described two labels respectively along clockwise and the inverse time needle ring be handed down to next node on the looped network;
D112, described node judge whether the FEC of described label mapping is oneself, if oneself, then finish to issue process, otherwise obtain two labels that described lower link point issues along up time needle ring and inverse time needle ring, and described label continued to be handed down to next node along up time needle ring and inverse time needle ring, continue then execution in step D112.
Wherein, when the ring exterior node when a lower link point on the looped network links to each other, described step D11 specifically comprises:
When the tag mapping information of D113, described ring exterior node arrived described lower link point on the looped network, described lower link point obtained corresponding tag mapping information;
D114, based on tag distribution protocol, the respective labels map information that obtains according to described down link point, be that the following link point on the looped network distributes two labels, and from described link point down, with described two labels respectively along clockwise and the inverse time needle ring be handed down to next node on the looped network;
D115, described node judge whether the FEC of described label mapping is oneself, if oneself, then finish to issue process, otherwise obtain two labels that described lower link point issues along up time needle ring and inverse time needle ring, and described label continued to be handed down to next node along up time needle ring and inverse time needle ring, continue then execution in step D115.
Wherein, when the ring exterior node when at least two lower link points on the looped network link to each other, described step D11 specifically comprises:
When each on the tag mapping information arrival looped network of D116, described ring exterior node descended link point, each lower link point obtained respectively corresponding tag mapping information;
D117, based on tag distribution protocol, according to the respective labels map information that each lower link point obtains, be that it distributes two labels, and set out take described lower link point as basic point, respectively along clockwise and the inverse time needle ring issue described two labels to next node;
D118, described node judge whether the FEC of described label mapping is oneself, if oneself, then finish to issue process, otherwise after node and ring exterior node obtain label from the looped network simultaneously according to a node, select the outer label of ring, abandon the principle of the label that node issues on the looped network, obtain the label that two lower link points on the looped network issue along up time needle ring or inverse time needle ring, and described label continued to be handed down to next node along up time needle ring and inverse time needle ring, continue then execution in step D118.
Wherein, among the step D12, the described pressed on ring node that calculates on the described label respective path based on Routing Protocol specifically comprises to the process of the internodal distance of described lower ring:
D121, based on Routing Protocol, set out take described lower link point as basic point, respectively along clockwise and the inverse time needle ring issue route to next node;
D122, described node judge whether the source address of described route is oneself, if oneself, then finish to issue process, otherwise obtain the route that described lower link point issues along up time needle ring and inverse time needle ring, and described route continued to be handed down to next node along up time needle ring and inverse time needle ring, continue then execution in step D122.
Wherein, among the step D12, when described pressed on ring node got access to described two labels, the pressed on ring node that obtains on the described label respective path specifically comprised to the process of the internodal distance of described lower ring:
D123, based on tag distribution protocol, when the forwarding equivalence class FEC that is the lower link point on the looped network distributes two labels, be its additional distance parameter;
D124, when from described lower link point, with described two labels and described distance parameter respectively along clockwise and the inverse time needle ring be handed down to next node on the looped network;
After D125, described node receive described label, judge whether the FEC of described label mapping is oneself, if then make the label that distributes invalid, and stop to continue to issue described label along clockwise and inverse time needle ring respectively; Otherwise, obtain described label, and the described distance parameter that will obtain adds 1, continue then respectively along clockwise and the inverse time needle ring issue described two labels and described distance parameter to next node, change then step D125 over to.
Wherein, described step D2 specifically comprises:
Based on described definite primary label switched path and label switched path information for subsequent use, set up the corresponding relation of the two, and described corresponding relation is recorded in the forwarding-table item.
Wherein, described step e specifically comprises:
The working condition of E1, the primary label switched path of detection;
E2, when described primary label switched path breaks down, according to the corresponding relation between described primary label switched path and label switched path for subsequent use, get access to label for subsequent use and next-hop interface for subsequent use on the label switched path for subsequent use;
E3, at the node of next-door neighbour's fault, the master of the message of described forwarding is gone encapsulation with label, encapsulate the described standby label that gets access to then, and forward by the described standby next-hop interface that obtains.
Wherein, described step e 1 specifically comprises
By in operation troubles detection messages between every a pair of node on the looped network, detect the working condition of primary label switched path.
As seen from the above technical solution provided by the invention, each pressed on ring node is set up respectively it to the primary label switched path of lower link point and the corresponding relation between label switched path for subsequent use on the looped network of the present invention; When primary label switched path breaks down, based on the MPLS technology, according to described corresponding relation operating path is switched on the label switched path for subsequent use.By the present invention, newly-increased on ring/as to remove in the process of a node, by switching, looped network still can be worked; And the present invention is independent of link layer protocol, and the link on the looped network between each node can be an any type, and the bandwidth on the ring between each node can be inequality, can adapt to various discharge models, so use more convenient; Moreover the present invention is based on the MPLS technology and E-Packet, thereby improve forward efficiency by shortest path; And failure detection protocol can operate between adjacent node, do not need around one week of ring, thereby can improve detection speed; In addition, among the present invention clockwise/the inverse time needle ring be based on control plane, logic, need not physically to separate at Forwarding plane, as adopting different optical fiber, and the present invention can support transannular, supports and being connected of other MPLS network, so can be suitable for different application scenarios.
In addition, the present invention is based on tag distribution protocol, two labels of a forwarding equivalence class FEC distribution for the following link point on the looped network, and from described link point down, with described two labels respectively along clockwise and the inverse time needle ring be handed down to other each node on the looped network, thereby can be respectively along the clockwise and counterclockwise independent allocation label of looped network to each node.
The present invention is based in addition tag distribution protocol, be two labels of a forwarding equivalence class FEC distribution of the lower link point on the looped network, and for it distance parameter is set; When from described lower link point, with described two labels respectively along clockwise and inverse time needle ring when being handed down on the looped network node, the value of described distance parameter is added 1, obtain described node to the distance of the route of described lower link point, therefore, when can distribute label for node on the looped network, calculate described node to internodal route distance corresponding to the FEC of label mapping.
Description of drawings
Fig. 1 is a flow chart of the present invention;
The principle schematic of Fig. 2 when only having distributing labels in the looped network situation among the present invention;
Fig. 3 among the present invention when leading when breaking down with label switched path, operating path is switched to the operation principle schematic diagram of standby label switched path;
Principle schematic when Fig. 4 links to each other distributing labels in the situation of (direct or indirect connected relation is arranged) for ring exterior node among the present invention with a lower link point on the looped network;
Principle schematic when Fig. 5 links to each other distributing labels in the situation of (direct or indirect connected relation is arranged) for ring exterior node among the present invention with two lower link points on the looped network;
The principle schematic of Fig. 6 during for the distributing labels under the situation of transannular among the present invention (two MPLS rings interconnect, and phase cross ring, tangent rings are arranged).
Embodiment
The present invention proposes a kind of method that adopts multiple label switching technology realization backup to switch at looped network, and its core is: the pressed on ring node on the looped network is set up respectively it to primary label switched path of lower link point and the corresponding relation between label switched path for subsequent use; When primary label switched path breaks down, based on described corresponding relation operating path is switched on the label switched path for subsequent use.
The invention provides a kind of multiple label switching technology that adopts and realize the method that backup is switched on looped network, its flow process comprises as described in Figure 1:
Pressed on ring node on step 101, the looped network gets access to looped network two labels that link point edge is clockwise and the inverse time needle ring is distributed up and down, the pressed on ring node that calculates on the described label respective path arrives the internodal distance of same lower ring, determines primary label switched path and label switched path for subsequent use according to result of calculation.
Specific implementation process comprises:
At first, based on tag distribution protocol, the pressed on ring node on the looped network obtains a lower link point on the looped network two labels that to be a FEC (forwarding equivalence class) issue along up time needle ring and inverse time needle ring; Or, obtain two labels that two different lower link points on the looped network issue along up time needle ring or inverse time needle ring for same FEC;
Then after described last link point gets access to described two labels, put the internodal distance of described ring down based on the last link that Routing Protocol calculates on the described label respective path, it is internodal main with label switched path and standby label switched path to determine that according to result of calculation described upward link is put described ring down; Or,
When described pressed on ring node gets access to described two labels, the pressed on ring node that obtains on the described label respective path arrives the internodal distance of described lower ring, and determines that according to distance described pressed on ring node is to the internodal primary label switched path of described lower ring and label switched path for subsequent use.
Based on described definite primary label switched path and label switched path information for subsequent use, set up the corresponding relation of the two, and described corresponding relation is recorded in the forwarding-table item.
First embodiment provided by the invention is described in conjunction with as shown in Figure 2 looped network, and its implementation process specifically comprises:
Step 201, based on tag distribution protocol, be that the lower link point on the looped network distributes two labels, and from described lower link point, with described two labels respectively along clockwise and the inverse time needle ring be handed down to each node on the looped network.
Step 202, the described link point of going up obtain two labels that described link point down issues along up time needle ring and inverse time needle ring.
LDP is usually operated under the mode of operation that the autonomous label distribution in downstream+free label keeps.Lower link point from the looped network sets out such as the node A among Fig. 2, and FEC (forwarding equivalence class) corresponding to address that the LDP agreement can be node A distributes 2 labels, and respectively along clockwise, counterclockwise direction distribution,
When a node on the looped network obtains a label from clockwise direction, no matter whether it all will continue to issue label to clockwise next node from counterclockwise having obtained the label of the same FEC of correspondence.When label distribution to above-mentioned down link point, during as the node A among Fig. 2, it judges that the FEC of this label mapping is oneself, makes the label that is assigned to invalid, and no longer continues along looped network direction distributing labels.As the same in the other direction.
Like this, label arrives certain the pressed on ring node on the looped network the most at last, i.e. the pressed on ring node of message is such as the node S among Fig. 2.A upward corresponding FEC of node S this moment has just obtained two labels.
After step 203, described pressed on ring node get access to described two labels, the pressed on ring node that calculates on the described label respective path based on Routing Protocol arrives the internodal distance of described lower ring, determines that according to result of calculation described pressed on ring node is to the internodal primary label switched path of described lower ring and label switched path for subsequent use.
Or,
Step 204, when described pressed on ring node gets access to described two labels, the pressed on ring node that obtains on the described label respective path arrives the internodal distance of described lower ring, and determines that according to distance described pressed on ring node is to the internodal primary label switched path of described lower ring and label switched path for subsequent use.
For improving resource utilization, reducing and transmit jumping figure, the message that enters looped network (going up ring) should leave looped network along shortest path.Therefore need to calculate pressed on ring node S to the shortest path between the lower link point A.Computational methods have two kinds:
First kind, adopt Routing Protocol to calculate:
Adopt Routing Protocol, as RIP, from last link point S, issue route with counter clockwise direction each node on looped network along clockwise direction respectively, when a node when clockwise direction obtains a route, no matter whether it all will continue to issue this route to clockwise next node from counterclockwise having obtained the route of same destination, every through a node, distance (going up the jumping figure between link point S and following link point A) adds 1.As the same in the other direction.
When route is published to down the link point, its judges that the destination address of route is oneself, makes this route invalid.So far, calculate pressed on ring node S respectively along clockwise direction with counterclockwise to two distances between lower link point A.
Compare these two distances then, when two distances were unequal, the short path of chosen distance was a primary path, otherwise selecting clockwise path is primary path.
Second, the label distribution behind the extension-based (LDP) agreement is calculated:
To tag distribution protocol, expand as the LDP agreement, the LDP agreement is FEC (FEC can be a network segment route or the main frame route) distributing labels of following link point, in the label distribution process, be the additional distance parameter of FEC, whenever, add 1, can calculate down link point respectively along clockwise direction with counterclockwise to the distance between the last link point, i.e. jumping figure through a node.
Compare then these two distances, when two distances were unequal, the short path of chosen distance was primary label switched path, and another is label switched path for subsequent use; When two distances equated, selecting clockwise path was primary label switched path, and the path is label switched path for subsequent use counterclockwise.
Step 205, based on described definite main with label switched path and standby label switched path information, set up the corresponding relation of the two, and described corresponding relation recorded in the forwarding-table item.
Step 206, the main working condition of detection with label switched path;
By in operation troubles detection messages between every a pair of node on the looped network, detect the working condition of primary label switched path.
Step 207, when described master breaks down with label switched path, according to described main, get access to standby label and standby next-hop interface on the standby label switched path with the corresponding relation between label switched path and standby label switched path;
Step 208, at the node of next-door neighbour's fault, the master of the message of described forwarding is gone encapsulation with label, encapsulate the described standby label that gets access to then, and forward by the described standby next-hop interface that obtains.For example adopt backup path as shown in Figure 3 to E-Packet.
At link to each other with a following link point on the looped network situation of (direct or indirect connected relation is arranged) of as shown in Figure 4 ring exterior node, the invention provides second embodiment, comprising:
When the tag mapping information of step 301, described ring exterior node arrived described lower link point on the looped network, described lower link point obtained corresponding tag mapping information.
The outer MPLS node of ring is only with the node (lower link point) on the ring, as the node A among Fig. 3 have directly/during indirect connected relation, corresponding FEC label mapping that this encircles the exterior node address at first arrives lower link point A.
Step 302, based on tag distribution protocol, the respective labels map information that obtains according to described down link point, be that the following link point on the looped network distributes two labels, and from described link point down, described two labels are handed down to each node on the looped network along up time needle ring and inverse time needle ring respectively.
Step 303, the described link point of going up obtain two labels that described link point down issues along up time needle ring and inverse time needle ring.
After step 304, described last link point get access to described two labels, put the internodal distance of described ring down based on the last link that Routing Protocol calculates on the described label respective path, it is internodal main with label switched path and standby label switched path to determine that according to result of calculation described upward link is put described ring down; Or,
Step 305, when described pressed on ring node gets access to described two labels, the pressed on ring node that obtains on the described label respective path arrives the internodal distance of described lower ring, and determines that according to distance described pressed on ring node is to the internodal primary label switched path of described lower ring and label switched path for subsequent use.
Step 306, based on described definite main with label switched path and standby label switched path information, set up the corresponding relation of the two, and described corresponding relation recorded in the standby forwarding-table item.
Step 307, the main working condition of detection with label switched path;
By in operation troubles detection messages between every a pair of node on the looped network, detect the working condition of primary label switched path.
Step 308, when described master breaks down with label switched path, according to described main, get access to standby label and standby next-hop interface on the standby label switched path with the corresponding relation between label switched path and standby label switched path;
Step 309, at the node of next-door neighbour's fault, the master of the message of described forwarding is gone encapsulation with label, encapsulate the described standby label that gets access to then, and forward by the described standby next-hop interface that obtains.
The specific implementation process of step 302 and step 309 is similar to the associated description among first embodiment, is not described in detail herein.
At at least two following link points on ring exterior node and the looped network situation of direct or indirect connected relation is arranged, the invention provides the 3rd embodiment, comprising:
When each on the tag mapping information arrival looped network of step 401, described ring exterior node descended link point, each lower link point obtained respectively corresponding tag mapping information;
Step 402, based on tag distribution protocol, according to the respective labels map information that each lower link point obtains, be that it distributes two labels, and set out take described lower link point as basic point, respectively along clockwise and the inverse time needle ring issue described two labels;
Step 403, after node and ring exterior node obtain label from the looped network simultaneously according to a node, select the outer label of ring, abandon the principle of the label that node issues on the looped network, the pressed on ring node on the looped network obtains the label that two lower link points on the looped network issue along up time needle ring or inverse time needle ring.
Take as shown in Figure 4 two lower link points as the example description of step 402 with the implementation procedure of step 403:
A following link point will encircle external tapping as the main interface of use that arrives the ring exterior node as the node A among Fig. 4, after this main label mapping of receiving the ring exterior node with interface, still to clockwise/counter clockwise direction issues tag mapping information respectively.When link point under another one, tag mapping information as the Node B among Fig. 4 is received, can find also to have obtained the label that distributes for same FEC from the ring external tapping, then stop at and transmit this tag mapping information in the ring.Node A only arrives pressed on ring node S on the looped network along the label of counterclockwise issue like this.
Link point under the another one on the same looped network, such as the Node B among the figure, the label of only issuing along clockwise direction arrives the pressed on ring node S on the looped network.
Through the above-mentioned process that issues label, the last link point S on the looped network can get access to the label that node A issues in the counterclockwise direction, and the label issued along clockwise direction of Node B.
After step 404, described pressed on ring node get access to described two labels, the pressed on ring node that calculates on the described label respective path based on Routing Protocol arrives the internodal distance of described lower ring, determines that according to result of calculation described pressed on ring node is to the internodal primary label switched path of described lower ring and label switched path for subsequent use.Or,
Step 405, when described pressed on ring node gets access to described two labels, the pressed on ring node that obtains on the described label respective path arrives the internodal distance of described lower ring, and determines that according to distance described pressed on ring node is to the internodal primary label switched path of described lower ring and label switched path for subsequent use.
Step 406, based on described definite main with label switched path and standby label switched path information, set up the corresponding relation of the two, and described corresponding relation recorded in the standby forwarding-table item.
Step 407, the main working condition of detection with label switched path.
By in operation troubles detection messages between every a pair of node on the looped network, detect the working condition of primary label switched path.
Step 408, when described master breaks down with label switched path, according to described main, get access to standby label and standby next-hop interface on the standby label switched path with the corresponding relation between label switched path and standby label switched path.
Step 409, at the node of next-door neighbour's fault, the master of the message of described forwarding is gone encapsulation with label, encapsulate the described standby label that gets access to then, and forward by the described standby next-hop interface that obtains.
The specific implementation process of step 404 and step 409 is similar to the associated description among first embodiment, is not described in detail herein.
The 3rd embodiment provided by the invention is equally applicable to the situation of transannular (two MPLS ring interconnects, and phase cross ring, tangent rings are arranged), is that example describes with as shown in Figure 6 phase cross ring.
Suppose flow from node S to node D, node D is along ring 1 distributing labels clockwise/counterclockwise, like this, node A, B obtain the tag mapping information of node corresponding D issue, continue then in ring 2 for node D in both direction distributing labels clockwise/counterclockwise, arrive Node B along clockwise label after because Node B is by encircling 1 label that has obtained arrival node D, therefore this label is terminated, and so only arrives node S along anticlockwise label.Equally, Node B ring be node D in 2 clockwise/counterclockwise both direction distributing labels, anticlockwise label terminates in node A, only has clockwise label arrival node S.Like this, obtain node D and obtained the label that label that node A issues in the counterclockwise direction and Node B are issued along clockwise direction.
Node D calculates the distance in path corresponding to the described label that obtains then, and determines primary label switched path and label switched path for subsequent use.
Set up the corresponding relation of primary label switched path and label switched path for subsequent use.When one of them node breaks down, message is sent to the D point of outer shroud by the another one node.As, when node A breaks down, the message that node S sends can with get back to Node B, arrive node D by the primary path of ring in 1 then.
At a kind of method that adopts the multiple label switching technology distributing labels on looped network provided by the invention, the specific implementation process of the 5th embodiment provided by the invention is as follows:
After step 3, described node receive described label, judge whether the FEC of described label mapping is oneself, if then make institute that distributed labels is invalid, and stop to continue to issue described label along clockwise and/or inverse time needle ring respectively; Otherwise obtain described label, and continue to issue described label along clockwise and/or inverse time needle ring respectively and give next node, change step 3 then over to.
At a kind of method that on looped network, adopts the multiple label switching technology distributing labels provided by the invention, when the ring exterior node when a following link point on the looped network links to each other, the specific implementation process of the 6th embodiment provided by the invention is as follows:
When the tag mapping information of step 1, described ring exterior node arrived described lower link point on the looped network, described lower link point obtained corresponding tag mapping information.
Step 3, from described lower link point, with described two labels respectively along clockwise and/or the inverse time needle ring is handed down to and the looped network node that link point is adjacent up and down.
After step 4, described node receive described label, judge whether the FEC of described label mapping is oneself, if then make institute that distributed labels is invalid, and stop to continue to issue described label along clockwise and/or inverse time needle ring respectively; Otherwise obtain described label, and continue to issue described label along clockwise and/or inverse time needle ring respectively and give next node, change step 4 then over to.
For a kind of method in looped network employing multiple label switching technology distributing labels provided by the invention, when the ring exterior node linked to each other with at least two lower link points on the looped network, the specific implementation process of the 7th embodiment provided by the invention was as follows:
When each on the tag mapping information arrival looped network of step 1, described ring exterior node descended link point, each lower link point obtained respectively corresponding tag mapping information.
Step 3, from described lower link point, with described two labels respectively along clockwise and/or the inverse time needle ring is handed down to and the looped network node that link point is adjacent up and down.
After step 4, described node receive described label, judge whether the FEC of described label mapping is oneself, if then make the label that distributes invalid, and stop to continue to issue described label along clockwise and/or inverse time needle ring respectively; Otherwise after node and ring exterior node obtain label from the looped network simultaneously according to a node, select the outer label of ring, abandon the principle of the label that node issues on the looped network, obtain the label that two lower link points on the looped network issue along up time needle ring or inverse time needle ring, and with described label continue respectively along clockwise or the inverse time needle ring be handed down to next node, change then step 4 over to.
At provided by the invention a kind of on looped network, adopt the multiple label switching technology computing route distance from method, the 8th embodiment provided by the invention comprises:
After step 3, described node receive described label, judge whether the FEC of described label mapping is oneself, if then make the label that distributes invalid, and stop to continue to issue described label along clockwise and inverse time needle ring respectively; Otherwise described distance parameter is added 1, and continue to issue described two labels along clockwise and inverse time needle ring respectively and give next node, change then step 3 over to.
By the technical scheme of above-mentioned prior art as can be seen, by the present invention, newly-increased on ring/as to remove in the process of a node, by switching, looped network still can be worked; And the present invention is independent of link layer protocol, and the link on the looped network between each node can be an any type, and the bandwidth on the ring between each node can be inequality, can adapt to various discharge models, so use more convenient; Moreover the present invention is based on the MPLS technology and E-Packet, thereby improve forward efficiency by shortest path; And failure detection protocol can operate between adjacent node, do not need around one week of ring, thereby can improve detection speed; In addition, among the present invention clockwise/the inverse time needle ring be based on control plane, logic, need not physically to separate at Forwarding plane, as adopting different optical fiber, and the present invention can support transannular, supports and being connected of other MPLS network, so can be suitable for different application scenarios.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (18)
1, a kind of method that adopts the multiple label switching technology distributing labels on looped network is characterized in that, comprising:
A, based on tag distribution protocol, be that a forwarding equivalence class FEC of the lower link point on the looped network distributes two labels, and from described lower link point, with described two labels respectively along clockwise and the inverse time needle ring be handed down to other each node on the looped network.
2, method according to claim 1 is characterized in that, described steps A specifically comprises:
A1, based on tag distribution protocol, be that a forwarding equivalence class FEC of the lower link point on the looped network distributes two labels;
A2, from described lower link point, with described two labels respectively along clockwise and/or the inverse time needle ring is handed down to and the looped network node that link point is adjacent up and down;
After A3, described node receive described label, judge whether the FEC of described label mapping is oneself, if then make the label that distributes invalid, and stop to continue to issue described label along clockwise and/or inverse time needle ring respectively; Otherwise obtain described label, and continue to issue described label along clockwise and/or inverse time needle ring respectively and give next node, change then steps A 3 over to.
3, method according to claim 2 is characterized in that, when the ring exterior node when a lower link point on the looped network links to each other, described steps A 1 specifically comprises:
When the tag mapping information of A11, described ring exterior node arrived described lower link point on the looped network, described lower link point obtained corresponding tag mapping information;
A12, based on tag distribution protocol, the respective labels map information that obtains according to described lower link point is that the lower link point on the looped network distributes two labels.
4, method according to claim 2 is characterized in that, when the ring exterior node when at least two lower link points on the looped network link to each other, described steps A 1 specifically comprises:
When each on the tag mapping information arrival looped network of A13, described ring exterior node descended link point, each lower link point obtained respectively corresponding tag mapping information;
A14, based on tag distribution protocol, according to each following respective labels map information of obtaining of link point, be that it distributes two labels.
5, method according to claim 2, it is characterized in that, in the steps A 3, when described node judges that the FEC of label mapping is not oneself, obtain described label, and continue to issue described label along clockwise and/or inverse time needle ring respectively and specifically comprise for the process of next node:
When described node judges that the FEC of label mapping is not oneself, after node and ring exterior node obtain label from the looped network simultaneously according to a node, select the outer label of ring, abandon the principle of the label that node issues on the looped network, obtain the label that two lower link points on the looped network issue along up time needle ring or inverse time needle ring, and with described label continue respectively along clockwise or the inverse time needle ring be handed down to next node.
6, a kind of multiple label switching technology computing route distance that adopts on looped network is characterized in that from method, comprising:
B, based on tag distribution protocol, be that a forwarding equivalence class FEC of the lower link point on the looped network distributes two labels, and for it distance parameter be set;
C, when from described lower link point, described two labels respectively along clockwise and inverse time needle ring when being handed down on the looped network node, are added 1 with the value of described distance parameter, obtain the distance that described node arrives the route of described lower link point.
7, method according to claim 6 is characterized in that, described step B specifically comprises:
B1, from described lower link point, with described two labels respectively along clockwise and the inverse time needle ring is handed down to and looped network about the adjacent node of link point;
After B2, described node receive described label, judge whether the FEC of described label mapping is oneself, if then make institute that distributed labels is invalid, and stop to continue to issue described label along clockwise and inverse time needle ring respectively; Otherwise execution in step B3;
B3, described distance parameter is added 1, and continue respectively along clockwise and the inverse time needle ring issue described two labels to next node, change then step B2 over to.
8, a kind of multiple label switching technology that adopts on looped network is realized the method that backup is switched, and it is characterized in that, comprising:
Pressed on ring node on D, the looped network is set up respectively it to primary label switched path and label switched path for subsequent use and the corresponding relation between them of lower link point;
E, when breaking down,, operating path is switched on the standby label switched path according to described corresponding relation based on multiple label switching technology with label switched path when main.
9, method according to claim 8 is characterized in that, described step D specifically comprises:
Pressed on ring node on D1, the looped network gets access to looped network two labels that link point edge is clockwise and the inverse time needle ring is distributed up and down, the pressed on ring node that calculates on the described label respective path arrives the internodal distance of same lower ring, and determines primary label switched path and label switched path for subsequent use according to result of calculation;
D2, set up the corresponding relation between primary label switched path and label switched path for subsequent use.
10, method according to claim 9 is characterized in that, described step D1 specifically comprises:
D11, based on tag distribution protocol, the pressed on ring node on the looped network obtains a lower link point on the looped network two labels that to be a forwarding equivalence class FEC issue along up time needle ring and inverse time needle ring; Or, obtain two labels that two different lower link points on the looped network issue along up time needle ring or inverse time needle ring for same FEC;
D12, calculate last link on the described label respective path based on Routing Protocol and put the internodal distance of described ring down, determine describedly to go up link to put described ring down internodal main with label switched path and standby label switched path according to result of calculation; Or,
When described pressed on ring node gets access to described two labels, the pressed on ring node that calculates and obtain on the described label respective path arrives the internodal distance of described lower ring, and determines that according to distance described pressed on ring node is to the internodal primary label switched path of described lower ring and label switched path for subsequent use.
11, method according to claim 10 is characterized in that, described step D11 specifically comprises:
D111, based on tag distribution protocol, be that the lower link point on the looped network distributes two labels, and from described lower link point, with described two labels respectively along clockwise and the inverse time needle ring be handed down to next node on the looped network;
D112, described node judge whether the FEC of described label mapping is oneself, if oneself, then finish to issue process, otherwise obtain two labels that described lower link point issues along up time needle ring and inverse time needle ring, and described label continued to be handed down to next node along up time needle ring and inverse time needle ring, continue then execution in step D112.
12, method according to claim 10 is characterized in that, when the ring exterior node when a lower link point on the looped network links to each other, described step D11 specifically comprises:
When the tag mapping information of D113, described ring exterior node arrived described lower link point on the looped network, described lower link point obtained corresponding tag mapping information;
D114, based on tag distribution protocol, the respective labels map information that obtains according to described down link point, be that the following link point on the looped network distributes two labels, and from described link point down, with described two labels respectively along clockwise and the inverse time needle ring be handed down to next node on the looped network;
D115, described node judge whether the FEC of described label mapping is oneself, if oneself, then finish to issue process, otherwise obtain two labels that described lower link point issues along up time needle ring and inverse time needle ring, and described label continued to be handed down to next node along up time needle ring and inverse time needle ring, continue then execution in step D115.
13, method according to claim 10 is characterized in that, when the ring exterior node when at least two lower link points on the looped network link to each other, described step D11 specifically comprises:
When each on the tag mapping information arrival looped network of D116, described ring exterior node descended link point, each lower link point obtained respectively corresponding tag mapping information;
D117, based on tag distribution protocol, according to the respective labels map information that each lower link point obtains, be that it distributes two labels, and set out take described lower link point as basic point, respectively along clockwise and the inverse time needle ring issue described two labels to next node;
D118, described node judge whether the FEC of described label mapping is oneself, if oneself, then finish to issue process, otherwise after node and ring exterior node obtain label from the looped network simultaneously according to a node, select the outer label of ring, abandon the principle of the label that node issues on the looped network, obtain the label that two lower link points on the looped network issue along up time needle ring or inverse time needle ring, and described label continued to be handed down to next node along up time needle ring and inverse time needle ring, continue then execution in step D118.
14, method according to claim 10 is characterized in that, among the step D12, describedly calculates last link on the described label respective path based on Routing Protocol and puts the process of the internodal distance of described ring down and specifically comprise:
D121, based on Routing Protocol, set out take described lower link point as basic point, respectively along clockwise and the inverse time needle ring issue route to next node;
D122, described node judge whether the source address of described route is oneself, if oneself, then finish to issue process, otherwise obtain the route that described lower link point issues along up time needle ring and inverse time needle ring, and described route continued to be handed down to next node along up time needle ring and inverse time needle ring, continue then execution in step D122.
15, method according to claim 10 is characterized in that, and is described when going up the link point and get access to described two labels among the step D12, obtains last link on the described label respective path and puts the process of the internodal distance of described ring down and specifically comprise:
D123, based on tag distribution protocol, when the forwarding equivalence class FEC that is the lower link point on the looped network distributes two labels, be its additional distance parameter;
D124, when from described lower link point, with described two labels and described distance parameter respectively along clockwise and the inverse time needle ring be handed down to next node on the looped network;
After D125, described node receive described label, judge whether the FEC of described label mapping is oneself, if then make the label that distributes invalid, and stop to continue to issue described label along clockwise and inverse time needle ring respectively; Otherwise, obtain described label, and the described distance parameter that will obtain adds 1, continue then respectively along clockwise and the inverse time needle ring issue described two labels and described distance parameter to next node, change then step D125 over to.
16, method according to claim 9 is characterized in that, described step D2 specifically comprises:
Based on described definite primary label switched path and label switched path information for subsequent use, set up the corresponding relation of the two, and described corresponding relation is recorded in the forwarding-table item.
17, according to Claim 8 to 16 any described methods, it is characterized in that described step e specifically comprises:
The working condition of E1, the primary label switched path of detection;
E2, when described primary label switched path breaks down, according to the corresponding relation between described primary label switched path and label switched path for subsequent use, get access to label for subsequent use and next-hop interface for subsequent use on the label switched path for subsequent use;
E3, at the node of next-door neighbour's fault, the master of the message of described forwarding is gone encapsulation with label, encapsulate the described standby label that gets access to then, and forward by the described standby next-hop interface that obtains.
18, method according to claim 17 is characterized in that, described step e 1 specifically comprises
By in operation troubles detection messages between every a pair of node on the looped network, detect the working condition of primary label switched path.
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